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Vermont Castings, Majestic Products DVRT36/39/43
10002428
Twist-lock Pipes
When using Vermont Castings, Majestic Products
twist-lock pipe it is not necessary to use sealant on the
joints. The only areas of the venting system that need
to be sealed with high temperature silicone sealant are
the collars on the fireplace and the sliding joint of any
telescopic vent section used in the system.
To join twist-lock pipes together, simply align the beads
of the male end with the grooves of the female end,
twisting the pipe until the flange on the female end
contacts external flange on the male end. It is
recommended that you secure the joints with three (3)
sheet metal screws; however, this is not mandatory
with twist-lock pipe. (Fig. 17)
To make it easier to assemble the joints we suggest
putting a lubricant (Vaseline or similar) on the male
end of the twist-lock pipe prior to assembly.
How to Use the Vent Graph
The Vent Graph should be read in conjunction with the
following vent installation instructions to determine the
relationship between the vertical and horizontal
dimensions of the vent system.
1. Determine the height of the center of the horizontal
vent pipe exiting through the outer wall. Using this
dimension on the Sidewall Vent Graph below, locate
the point intersecting with the slanted graph line.
2. From the point of this intersection, draw a vertical
line to the bottom of the graph.
3. Select the indicated dimension, and position the
fireplace in accordance with same.
Example A:
If the vertical dimension from the floor of the fire-
place is 11’ (3.4m), the horizontal run to the face of
the outer wall must not exceed 14’ (4.3m).
Example B:
If the vertical dimension from the floor of the unit is
7’ (2.14m), the horizontal run to the face of the outer
wall must not exceed 8¹⁄₂’ (2.6m).
Rear Wall Vent Application
When installed as a rear vent unit this appliance may
be vented directly to a termination located on the rear
wall behind the appliance.
• Only Vermont Castings, Majestic Products venting
components are approved to be used in these
applications. See ‘Venting Components’ listed for
different installation requirements.
• The maximum horizontal distance between the rear
of the appliance (or end of the transition elbow in a
corner application) and the outside face of the rear
wall is 20” (508 mm). (Fig. 19)
• Only one 45° elbow is allowed in these installations.
• The minimum clearances between any combustible
material and the vent pipe sections are:
Top 2” (51mm)
Sides 1” (25mm)
Bottom 1” (25mm)
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3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
eg: A
eg: B
Horizontal dimension from the outside face of
the wall to the center of the fireplace vent flange
Vertical dimension from the floor of the unit
to the center of the horizontal vent pipe
Sidewall Vent Graph showing the relationship between vertical
and horizontal dimensions for a Direct Vent flue system.
CFM102
Fig. 18 Sidewall Vent Graph (dimensions in ft.).
Male End
Female End
Screw Holes
TWL100
Fig. 17 Twist-lock pipe joints.